Add asio.

[SVN r82555]

feed/history/boost_1_53_0.qbk

@@ -3,7 +3,7 @@
     [source-mode c++]
     [purpose
     New Libraries: Atomic, Coroutine, Lockfree, Multiprecision, Odeint.
-    Updated Libraries: Algorithm, Array, Bimap, Container, Context,
+    Updated Libraries: Algorithm, Array, Asio, Bimap, Container, Context,
         Geometry, GIL, Graph, Hash, Interprocess, Intrusive,
         Lexical Cast, Locale, Math, MinMax, Move, Polygon, Random,
         Range, Ratio, Regex, Smart Pointers, StringAlgo, Thread,
@@ -45,6 +45,23 @@
 * [phrase library..[@/libs/array/ Array]:]
   * Added support for boost::get and std::get ([ticket 7652])
 
+* [phrase library..[@/libs/asio/ Asio]:]
+  * Fixed some 64-to-32-bit conversion warnings ([ticket 7459]).
+  * Fixed some small errors in documentation and comments ([ticket 7761]).
+  * Fixed an error in the example embedded in `basic_socket::get_option`'s
+    documentation ([ticket 7562]).
+  * Changed to use `long` rather than `int` for SSL_CTX options, to match OpenSSL
+    ([ticket 7209]).
+  * Changed to use `_snwprintf` to address a compile error due to the changed
+    `swprintf` signature in recent versions of MinGW ([ticket 7373]).
+  * Fixed a deadlock that can occur on Windows when shutting down a pool of
+    `io_service` threads due to running out of work ([ticket 7552]).
+  * Enabled the `noexcept` qualifier for error categories ([ticket 7797]).
+  * Changed UNIX domain socket example to treat errors from `accept` as non-fatal
+    ([ticket 7488]).
+  * Added a small block recycling optimisation to improve default memory
+    allocation behaviour.
+
 * [phrase library..[@/libs/bimap/ Bimap]:] 
   * Refactor map_view_iterator to improve error messages.
   * Fixed replace_(left/right/key/data) bug when using relations with info.